Steam-boiler.



PATENTED FEB. 21, 1905.

T. T. PARKER; STEAM BOILBR.

APPLICATION FILED MAY 26, 1904.

2 SHEETS-SHEET 1.

No. 783,220. PATENTED FEB. 21, 1905. T. T. PARKER.

STEAM BOILBR.

APPLICATION FILED MAY 2s, 1904.

2 SHEETS-SHEET 2.

@Nima STATES `l'atented February 21, 1905,

ArtNr erica.

THOMAS THRALL PARKER, OF NEW YORK, N. Y., ASSIGNOR OF ONE- FOURTH TO D. CARROLL HARVEY, OF NEV YORK, N. Y.

STEAM BOILER;

SPECIFICATION forming part of Letters Patent No. 783,220, dated February 21, 1905.

Application filed May 26, 1904. Serial No, 209,851.

To all w21/0m, it 11e/ty concern:

Be it known that 1, THOMAS TI-IRALL PAR- KER, of New York, in the county and State of New York, have invented certain new and useful Improvements in Steam-Boilers, of which the following is a specification illustrated by the accompanying drawings.

This invention, while embodying features which may be applied to various types and styles of steam-boilers, is more particularly adapted for use and is shown and described as applied to a stationary water-tube boiler having horizontally-inclined water-tubes.

The style of boiler here described does not involve any radical departure from the recognized types now in use, but avoids certain features which are open to criticism and replaces them with an improved form of construction.

The object of this invention is, first, to construct a boiler which will purify its own feedwater and prevent scaling, thus adding to the boilers efliciency and decreasing the amount of repairs necessary; secondly, in obviating the necessity of ilanging the sheets of the waterlegs by using steel channels in constructing the water-legs, the Hanging, .with its attendant distortions andirregularities, being done away with; thirdly, to improve on the methodA at present in vogue to brace the iiat surfaces of the water-legs by constructing a brace which will be stronger and less liable to corrosion than the screwed stay-bolts now in use. By carrying the feed-water through the steam and water drum and then discharging the feed-water into a water-drum located below and directly connected with the steam and water drum the feed-water is heated to the temperature of the steam-drum prior to the discharge into the water-drum and the solid matter contained in the feed-water is liberated and falls by gravity into the lower part of the water-drum, from which it may be blown off or cleaned out as occasion demands. This water-drum is located directly beneath the steam and water drum, but at such a distance from the iire that the water within it is not acted upon by the high temperatures, and therefore there will be but little circulation within it due to heat, and the solid matter will be allowed to quietly settle in the bottom. In this manner the solid impurities are eliminated from the water without loss of heat, and the Otherparts of the boiler are kept free from scale.

The water-legs or headers in the types of boilers heretofore in use are cast in one piece for each vertical row of tubes in order to allow of the desired circulation from the tubes into the steam and water drum. To construct the header or water-leg in one piece in the form of one rectangular boX adapted to receive steam and water from alll of the tubes would involve the use of threaded stay-bolts attached to the sheets of said water-leg, the bolts being inserted in the usual manner through holes in the sheets. By this means the strength of the bolt lies in the strength of the threads upon it, and if the mill finish on the bolt is once broken corrosion will take place quite rapidly and the bolts weaken rapidly. These and other objections are done away with by constructing the water-leg of two large flat metal sheets fastened together at the edges by channel-bars of open-hearth steel and bracing the sides of the box together by means of stay-braces having at unbroken surfaces not subject to corrosion. By this means all distortion of the side plates, depreciation of the metal due to bending when iianged, and all unequal strains set up by unequal heating and cooling will be obviated.

The invention herein described relates more particularly to the construction of a water heater and purifier. The construction of the water-legs and the method of bracing them are described and claimed in another application, filed December 30, 1904, Serial No. 238,892, which forms a division of this present application.

ln the drawings, Figure 1 is a side elevation of the boiler, showing the steam-drum,

`partly broken away. Fig. 2 is a cross-sed tion on the plane 2 2 of Fig. 1. Fig'. 3 lis a detail of the construction of the bottom of` the rear water-leg, seen in section. Fig. eL is a side view of the punched blank forming the brace. Fig. is a cross-section'of a part of one of the legs on the plane 5 5, Fig. 6, the brace being riveted in position; and Fig. 6, an inside view of one of the plates.

IOO

The boiler consists in the mainof the horizontal steam and water drum a, suspended in the usual manner by the supports from wrought-iron girders supported by iron columns, (neither of which is shown.) Beneath this drum are arranged the water-tubes c, placed at an angle to the horizontal. These water-tubes are connected with each other and with the drum by means of .the water-legs d and e, which are provided with vertical passages adapted to'allow ot' an easy llow of water from one of the tubes to the other.

The pipe f is connected at one end with the supply of feed-water and at the other end enters the drum a and extends within the drum for about two-thirds the length ot' the drum. Attached to this end of the feed-pipe by an elbow is the vertical pipe a, which has the two lateral horizontal arms /L and t. Located beneath the drum a and directly connected therewith by a series of openings fr is the water-d rum j', into which the pipe g discharges. This drum j is provided with a manhole l and a blow-olf Z. rfhe feed-water entering by means of the horizontal pipe f Hows into the d rum .7' by means of the pipes g and /t and after iilling the drum y' Hows upward and into the steam and water drum a and by means of the leg's CZ and e into the tubes c. A lire being started on the grate m, the heated air and products of combustion will pass upward among the pipes c, which are staggered to enable the least loss by interference or' one pipe with another, the gases passing over the baH'leplates fa and o and to the chimney through the opening j). The water in the v front portion of the tubes will receive the greatest amount of heat, and the steam passing from one tube to another by means ot' the legs Z and a a current will be produced of water and steam flowing upward in the leg e into the drum a, the steam passing' off from this drum in an appropriate manner. The water, which is gradually cooling, will descend by means ot' the leg Z into the tubes c and the operation be indelinitely repeated.

The water-legs or headers are constructed -of the fiat steel plates 0 joined together at the top, bottom, and sides by means of the channel-bars p', which are riveted tothe side plates in the manner shown in Fig. 3. In Fig. 3 is .also shown one of the water-tubes c. which y are flanged on the inside of the water-leg in the well-known manner. In the outside ot' each of the water-legs at points opposite where the tubes enter the legs holes are drilled through the sides 0 and the hand-hole cover q inserted, which has a head larger than the opening', and thus adapted to bear tightly against the inner surface of the leg as the pressure oi' the water bears against it. This hand -hole is provid ed withthe ordinary style of cover, as shown, which may readily be removed and the tubes cleaned from all impurities.

As above described, bracing o't' a water-leg of the type shown has been done by using a screwed stay-bolt with which to hold the two sides ot' the leg in position, which l'orm of construction was for certain reasons objectionable. Instead ot' using a stay-bolt a sheet of flange-steel about a quarter of an inch thick is taken, and by means of an appropriate die a metal blank is made, such as is shown in Fig. 4I. The blank r is then doubled along the line ot' its center. The ends of the blank .containing the holes s are then bent to a horizontal position, so that the brace takes the form of a double T. It then is placed between the walls of the water-leg opposite holes which have been drilled in the walls and then riveted firmly in place.. It is to be observed that the rivet-heads extend over and overlap the sheet otl metal forming the brace, so that greater strength is imparted to the brace than would be the case it' the ordinary stay-bolt was employed; also, that the surface is not broken, as is the case with a threaded surface, and the danger of corrosion is therefore greatly lessened. These braces can be placed in any convenient manner between the tubes,

Vas shown in Fig. 3 and Fig. 6, as they thus offer but little obstruction to the flow ot' water in the leg/s. l

Without describing the many modifications of which this invention is capable or the different forms -in which it may be embodied,

what I desire to secure by Letters Patent is the following:

l. In combination in a steam-boiler, a steam and water drum, a series ot' horizontally-inclined water-tubes located below said steam and water drum, means for connecting said tubes with said steam and water drum, a water-drum located beneath said ste-am and water drum and above said tubes, and connected with the lirst-said drum by means ot' openings, a feed-water pipe passing through said steam and water drum and'discharging into said water-drum, substantially as set forth and described.

2. In combination in a steam-boiler, asteam and water drum, a series of horizontally-inclined water-tubes located below said steam IOO IIO

and water drum, means for connecting said tubes with said steam and water drum, a water-drum located between said tubes and the i first-named drum and removed from the direct heat upon said tubes, said water-drum being directly connected with the lirst-said drum,-

THOMAS THRALL PARKER.A

Witnesses:

A. C. KENDAL'L, H. S. MoRToN. 

